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139 lines
3.7 KiB
C++
139 lines
3.7 KiB
C++
//===-- Instruction.cpp - Implement the Instruction class --------*- C++ -*--=//
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//
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// This file implements the Instruction class for the VMCore library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Function.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/Type.h"
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#include "Support/LeakDetector.h"
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Instruction::Instruction(const Type *ty, unsigned it, const std::string &Name,
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Instruction *InsertBefore)
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: User(ty, Value::InstructionVal, Name) {
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Parent = 0;
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iType = it;
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// Make sure that we get added to a basicblock
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LeakDetector::addGarbageObject(this);
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// If requested, insert this instruction into a basic block...
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if (InsertBefore) {
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assert(InsertBefore->getParent() &&
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"Instruction to insert before is not in a basic block!");
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InsertBefore->getParent()->getInstList().insert(InsertBefore, this);
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}
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}
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void Instruction::setParent(BasicBlock *P) {
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if (getParent())
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LeakDetector::addGarbageObject(this);
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Parent = P;
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if (getParent())
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LeakDetector::removeGarbageObject(this);
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}
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// Specialize setName to take care of symbol table majik
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void Instruction::setName(const std::string &name, SymbolTable *ST) {
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BasicBlock *P = 0; Function *PP = 0;
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assert((ST == 0 || !getParent() || !getParent()->getParent() ||
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ST == &getParent()->getParent()->getSymbolTable()) &&
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"Invalid symtab argument!");
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if ((P = getParent()) && (PP = P->getParent()) && hasName())
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PP->getSymbolTable().remove(this);
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Value::setName(name);
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if (PP && hasName()) PP->getSymbolTable().insert(this);
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}
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const char *Instruction::getOpcodeName(unsigned OpCode) {
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switch (OpCode) {
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// Terminators
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case Ret: return "ret";
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case Br: return "br";
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case Switch: return "switch";
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case Invoke: return "invoke";
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// Standard binary operators...
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case Add: return "add";
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case Sub: return "sub";
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case Mul: return "mul";
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case Div: return "div";
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case Rem: return "rem";
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// Logical operators...
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case And: return "and";
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case Or : return "or";
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case Xor: return "xor";
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// SetCC operators...
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case SetLE: return "setle";
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case SetGE: return "setge";
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case SetLT: return "setlt";
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case SetGT: return "setgt";
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case SetEQ: return "seteq";
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case SetNE: return "setne";
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// Memory instructions...
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case Malloc: return "malloc";
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case Free: return "free";
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case Alloca: return "alloca";
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case Load: return "load";
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case Store: return "store";
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case GetElementPtr: return "getelementptr";
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// Other instructions...
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case PHINode: return "phi";
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case Cast: return "cast";
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case Call: return "call";
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case Shl: return "shl";
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case Shr: return "shr";
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default: return "<Invalid operator> ";
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}
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return 0;
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}
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/// isAssociative - Return true if the instruction is associative:
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///
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/// Associative operators satisfy: x op (y op z) === (x op y) op z)
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///
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/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative, when not
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/// applied to floating point types.
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///
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bool Instruction::isAssociative(unsigned Opcode, const Type *Ty) {
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if (Opcode == Add || Opcode == Mul ||
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Opcode == And || Opcode == Or || Opcode == Xor) {
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// Floating point operations do not associate!
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return !Ty->isFloatingPoint();
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}
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return 0;
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}
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/// isCommutative - Return true if the instruction is commutative:
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///
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/// Commutative operators satistify: (x op y) === (y op x)
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///
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/// In LLVM, these are the associative operators, plus SetEQ and SetNE, when
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/// applied to any type.
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///
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bool Instruction::isCommutative(unsigned op) {
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switch (op) {
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case Add:
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case Mul:
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case And:
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case Or:
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case Xor:
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case SetEQ:
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case SetNE:
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return true;
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default:
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return false;
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}
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}
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